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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693547.0, MPI für Astronomie / Publikationen_mpia
The Herschel PACS photometer calibration. A time dependent flux calibration for the PACS chopped point-source photometry AOT mode
Authors:Nielbock, M.; Müller, T.; Klaas, U.; Altieri, B.; Balog, Z.; Billot, N.; Linz, H.; Okumura, K.; Sánchez-Portal, M.; Sauvage, M.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Experimental Astronomy
Issue / Number:3
Start Page:631
End Page:660
Audience:Not Specified
Abstract / Description:We present a flux calibration scheme for the PACS chopped point-source photometry observing mode based on the photometry of five stellar standard sources. This mode was used for science observations only early in the mission. Later, it was only used for pointing and flux calibration measurements. Its calibration turns this type of observation into fully validated data products in the Herschel Science Archive. Systematic differences in calibration with regard to the principal photometer observation mode, the scan map, are derived and amount to 5 - 6 %. An empirical method to calibrate out an apparent response drift during the first 300 Operational Days is presented. The relative photometric calibration accuracy (repeatability) is as good as 1 % in the blue and green band and up to 5 % in the red band. Like for the scan map mode, inconsistencies among the stellar calibration models become visible and amount to 2 % for the five standard stars used. The absolute calibration accuracy is therefore mainly limited by the model uncertainty, which is 5 % for all three bands.
Free Keywords:Herschel Space Observatory; PACS; Far-infrared; Instrumentation; Calibration; Chopping
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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